Practice Test Geeks(EETC) Electrical Technician Certification Practice Test
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Wiring Methods Flashcards

7 cards from real EETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Wiring Methods flashcards as text

  1. Which wiring method is specifically prohibited in ducts, plenums, or other air-handling spaces unless it is specifically listed for plenum use?

    Answer: Type NM-B cable

    NEC 300.22 prohibits Type NM-B cable in ducts or plenums because it is not listed for plenum use and produces toxic gases when burned.

  2. What is the maximum trade size for electrical nonmetallic tubing (ENT) permitted by the NEC?

    Answer: 3 inches

    NEC 362.20 limits ENT to a maximum trade size of 2 inches; larger sizes are not listed or manufactured for ENT.

  3. In a concealed knob-and-tube wiring system found in older construction, what is prohibited from being done without special approval?

    Answer: Insulating over the wiring with thermal insulation

    NEC 394.12 prohibits covering knob-and-tube wiring with thermal insulation because it depends on open-air cooling and insulation causes overheating.

  4. What is the purpose of an expansion fitting (expansion joint) in a conduit installation?

    Answer: To compensate for thermal expansion and contraction

    Expansion fittings accommodate the linear expansion and contraction of conduit due to temperature changes, preventing stress on the system.

  5. When using surface metal raceways (Type 386), what is the primary NEC concern regarding splices?

    Answer: Splices must only be made at listed splice boxes or fittings

    NEC 386.56 permits splices in surface metal raceways only at listed junction boxes or fittings designed for that purpose.

  6. For a service entrance using rigid metal conduit, where must a conduit seal or plugged fitting be installed?

    Answer: Within 18 inches of the service entrance equipment

    NEC 230.8 requires raceways to be arranged to drain and be sealed or plugged at the upper end to prevent moisture from entering the service equipment.

  7. Which statement is TRUE about using aluminum EMT?

    Answer: Aluminum EMT is lighter and approved for most dry locations

    Aluminum EMT is listed and permitted; it is lighter than steel EMT and is suitable for dry locations, though it cannot be buried in concrete or earth due to corrosion concerns.